The two sources disagree on the effectiveness and feasibility of recycling programs in schools.
The first source emphasizes the importance of participation from school districts for recycling programs to have a significant impact on reducing greenhouse gas emissions. In contrast, the second source expresses skepticism about the ability of schools to implement a successful recycling program due to the challenges in getting all students to comply and the potential costs involved.
Therefore, the best answer to the question is:
Successful recycling programs require the participation of many people.